That document does not go with this player. The deck is a Garrard (RC110 or rc111) not a BSR. The gram is a
COSSOR model 522 by the look of it.
You are wise not to plug it in. There are likely to be components which will go bang if you do. It also has the original GC2 cartridge fitted, which will likely e dead by now, and in any case is not usable on stereo records.
This is a nice unit, I would date it as mid 1950s (others will correct me here!) and more sought after than the later types. As to value, search for sold items in comparable (i.e. unrestored) conditions and similar vintage on ebay. HTH.